T.D.S. (total dissolve solids) meter measures salinity from dissolved solids. Reading of the Colorado River, here, indicates high salinity, May 1972
| Uploaded by | U.S. National Archives |
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| Date taken | 1972-05 |
| Date uploaded | 2012-05-07 |
| Tags | nara:arcid=549052, usnationalarchives, environmentalprotectionagency, documerica |
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